United Nations (UN), international organization established on October 24, 1945. The United Nations (UN) was the second multipurpose international organization established in the 20th century that was worldwide in scope and membership. Its predecessor, the League of Nations, was created by the Treaty of Versailles in 1919 and disbanded in 1946. Headquartered in New York City, the UN also has regional offices in Geneva, Vienna, and Nairobi. Its official languages are Arabic, Chinese, English, French, Russian, and Spanish. For a list of UN member countries and secretaries-general, see below.

First session of the United Nations General Assembly, January 10, 1946, at the Central Hall in …

to save succeeding generations from the scourge of war,…to reaffirm faith in fundamental human rights,…to establish conditions under which justice and respect for the obligations arising from treaties and other sources of international law can be maintained, and to promote social progress and better standards of life in larger freedom.

In addition to maintaining peace and security, other important objectives include developing friendly relations among countries based on respect for the principles of equal rights and self-determination of peoples; achieving worldwide cooperation to solve international economic, social, cultural, and humanitarian problems; respecting and promoting human rights; and serving as a centre where countries can coordinate their actions and activities toward these various ends.

The UN formed a continuum with the League of Nations in general purpose, structure, and functions; many of the UN’s principal organs and related agencies were adopted from similar structures established earlier in the century. In some respects, however, the UN constituted a very different organization, especially with regard to its objective of maintaining international peace and security and its commitment to economic and social development.

Changes in the nature of international relations resulted in modifications in the responsibilities of the UN and its decision-making apparatus. Cold War tensions between the United States and the Soviet Union deeply affected the UN’s security functions during its first 45 years. Extensive post-World War II decolonization in Africa, Asia, and the Middle East increased the volume and nature of political, economic, and social issues that confronted the organization. The Cold War’s end in 1991 brought renewed attention and appeals to the UN. Amid an increasingly volatile geopolitical climate, there were new challenges to established practices and functions, especially in the areas of conflict resolution and humanitarian assistance. At the beginning of the 21st century, the UN and its programs and affiliated agencies struggled to address humanitarian crises and civil wars, unprecedented refugee flows, the devastation caused by the spread of AIDS, global financial disruptions, international terrorism, and the disparities in wealth between the world’s richest and poorest peoples.

The United States, the United Kingdom, and the Soviet Union took the lead in designing the new organization and determining its decision-making structure and functions. Initially, the “Big Three” states and their respective leaders (Roosevelt, Churchill, and Soviet premier Joseph Stalin) were hindered by disagreements on issues that foreshadowed the Cold War. The Soviet Union demanded individual membership and voting rights for its constituent republics, and Britain wanted assurances that its colonies would not be placed under UN control. There also was disagreement over the voting system to be adopted in the Security Council, an issue that became famous as the “veto problem.”

The first major step toward the formation of the United Nations was taken August 21–October 7, 1944, at the Dumbarton Oaks Conference, a meeting of the diplomatic experts of the Big Three powers plus China (a group often designated the “Big Four”) held at Dumbarton Oaks, an estate in Washington, D.C. Although the four countries agreed on the general purpose, structure, and function of a new world organization, the conference ended amid continuing disagreement over membership and voting. At the Yalta Conference, a meeting of the Big Three in a Crimean resort city in February 1945, Roosevelt, Churchill, and Stalin laid the basis for charter provisions delimiting the authority of the Security Council. Moreover, they reached a tentative accord on the number of Soviet republics to be granted independent memberships in the UN. Finally, the three leaders agreed that the new organization would include a trusteeship system to succeed the League of Nations mandate system.

The Dumbarton Oaks proposals, with modifications from the Yalta Conference, formed the basis of negotiations at the United Nations Conference on International Organization (UNCIO), which convened in San Francisco on April 25, 1945, and produced the final Charter of the United Nations. The San Francisco conference was attended by representatives of 50 countries from all geographic areas of the world: 9 from Europe, 21 from the Americas, 7 from the Middle East, 2 from East Asia, and 3 from Africa, as well as 1 each from the Ukrainian Soviet Socialist Republic and the Belorussian Soviet Socialist Republic (in addition to the Soviet Union itself) and 5 from British Commonwealth countries. Poland, which was not present at the conference, was permitted to become an original member of the UN. Security Council veto power (among the permanent members) was affirmed, though any member of the General Assembly was able to raise issues for discussion. Other political issues resolved by compromise were the role of the organization in the promotion of economic and social welfare; the status of colonial areas and the distribution of trusteeships; the status of regional and defense arrangements; and Great Power dominance versus the equality of states. The UN Charter was unanimously adopted and signed on June 26 and promulgated on October 24, 1945.

Principles and membership

The purposes, principles, and organization of the United Nations are outlined in the Charter. The essential principles underlying the purposes and functions of the organization are listed in Article 2 and include the following: the UN is based on the sovereign equality of its members; disputes are to be settled by peaceful means; members are to refrain from the threat or use of force in contravention of the purposes of the UN; each member must assist the organization in any enforcement actions it takes under the Charter; and states that are not members of the organization are required to act in accordance with these principles insofar as it is necessary to maintain international peace and security. Article 2 also stipulates a basic long-standing norm that the organization shall not intervene in matters considered within the domestic jurisdiction of any state. Although this was a major limitation on UN action, over time the line between international and domestic jurisdiction has become blurred.

New members are admitted to the UN on the recommendation of the Security Council and by a two-thirds vote of the General Assembly. Often, however, the admittance of new members has engendered controversy. Given Cold War divisions between East and West, the requirement that the Security Council’s five permanent members (sometimes known collectively as the P-5)—China, France, the Soviet Union (whose seat and membership were assumed by Russia in 1991), the United Kingdom, and the United States—concur on the admission of new members at times posed serious obstacles. By 1950 only 9 of 31 applicants had been admitted to the organization. In 1955 the 10th Assembly proposed a package deal that, after modification by the Security Council, resulted in the admission of 16 new states (4 eastern European communist states and 12 noncommunist countries). The most contentious application for membership was that of the communist People’s Republic of China, which was placed before the General Assembly and blocked by the United States at every session from 1950 to 1971. Finally, in 1971, in an effort to improve its relationship with mainland China, the United States refrained from blocking the Assembly’s vote to admit the People’s Republic and to expel the Republic of China (Taiwan); there were 76 votes in favour of expulsion, 35 votes opposed, and 17 abstentions. As a result, the Republic of China’s membership and permanent Security Council seat were given to the People’s Republic.

Controversy also arose over the issue of “divided” states, including the Federal Republic of Germany (West Germany) and the German Democratic Republic (East Germany), North and South Korea, and North and South Vietnam. The two German states were admitted as members in 1973; these two seats were reduced to one after the country’s reunification in October 1990. Vietnam was admitted in 1977, after the defeat of South Vietnam and the reunification of the country in 1975. The two Koreas were admitted separately in 1991.

Following worldwide decolonization from 1955 to 1960, 40 new members were admitted, and by the end of the 1970s there were about 150 members of the UN. Another significant increase occurred after 1989–90, when many former Soviet republics gained their independence. By the early 21st century the UN comprised nearly 190 member states.

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The United Nations is an organization that includes almost all the world’s countries, or nations. It is called the UN for short. By the 21st century the United Nations had more than 190 members. The main goal of the United Nations is world peace. The United Nations also works to reduce poverty and suffering and to improve people’s lives in other ways.

The United Nations (UN) is an association of independent countries that agreed to work together to prevent and end wars. The UN also attempts to improve social conditions by promoting international cooperation, economic development, public health, environmental conservation, and human rights. Members of the UN are supposed to cooperate peacefully and resolve differences diplomatically rather than rely on force; however, this ideal has not always been met. The UN does not make laws or act as a world government, but it does provide opportunities for discussion, cooperation, and actions that serve the interests of its members. The UN was founded by 51 countries in 1945. Membership was eventually extended to almost every country on Earth, growing to 193 member countries (also called member states) by 2011.

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